Mill and method for rolling tubes.



P. CAPROM MILL AND METHOD FOR ROLLING TUBES.

APPLICATION FILED APR.25, 1967.

Patented June 8. 1909.

IN ENTGR WITNESSES F. GAPRON. MILL AND'MBTHOD FOR ROLLING TUBES.

APPLIATIoN FILED APR.25,1907.

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INVENTOR @am I. mm,

b l-:VAQtys M. P. GAPRON. MILL -AND METHOD FOR 'ROLLING TUBES. APPLIUATION HLED APR. 25. 1907.

923,944. r vPal-.emma June 8,1909.

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FI E El INVENTOR tty s I M. F. GAPRON. MILL AND METHD'POR ROLLING TUBES.

APPLIUATION FILED APB. 25, 1901.

923,944. Patented J1111e8 9.

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groove or' grooves for furtherjreductionl MARSHALL EcA'PRoN', or ELrRIA,-oH1o. y mi. am: mrrnon rca nommc'mns.

Specification of Letters Patent. Application mea Api-n 25, 1907. serial Np. 370,316.

To all 'whom may camera' Be it known that I, MARsHALL F. Carnon,l fl residing at Elyria, in the county of Lorain and State of Ohio, acitize'n of the Lm'ted 5 States, have invented or discovered certain new and useful Imlgove'ments in Mills forand Methods ofRo g Tubes, of which improvements theifollowingisa specification. The invention described herein relates to certain improvementsin mills for rolling tubes,.etc., and has for'its object amon other things the provision of means where y the tube may be rolls out of contact with the rolls so as to permit of the tube being passed through other The invention is hereinafter more fully described and claimed. g

In the accompanying drawings, forming part'oi this specification, Figure 1 is a top plan view of my improved mill; Fig. 2 is a side elevation of the same; Fig. '3 is a sectional view indicated by the line I1 [-'-I[I Fig.`

1; 4 is a similar view of the opposite side receiving' table; Fig. 6 1s a plan view on an enlarged scale of the rear portion of the recei table showing the means for shifting the b' et; F

transverse viewpartly in section an partly in elevation of theieceiving table; F iv. 9 is a detail view showin the reducing rollls, the billet returning ro ers and portions of the section and partly in top plan of t e parts shown in Fig. 9; and Fig. 11 shows the oruides ar'lsanged on the delivery side of the delivery ro In the practice of my invention the reducing rolls 1, provided with suitable grooves for operating on the hollow billet, said grooves being of the same or varying in diameter, are arranged in suitable housings 2. The boxes 3 carrying .the upper rolls are pressed upward by the usua and well known means consisting of weighted levers or counterbalancing yokesfl supporting rods 5, whose upper ends bear against theboxes 3. The upper roll is forced down against the upward pressure exerted by the levers or yoke 4 by means of screws 6 having pinions 7 on their u per ends, said pinions intermeshinv `with elle gear wheel 8 mounted on a short snhaft 9 to which is also secured a pinion 10. This pinion intermeshes with a rack bar 11 adaptreturned to the feed side of theof the mill; Fig. 5 is an end elevation of theig. 7 is a sectional elevation of the constructionshown in Fig. 6 F'. 8 is a guides for the mill; Fig. 10is a view artly inl ed to be shifted by any suitable means,` as a uid pressure cylinder (not shown), so as to rotate the screws 6 andthereby permit the upward movement of the upper rolls, or

-force it down into operative re ationwith the lower roll. Windows are formedy in the housings on each side of the reducing rolls for Athe reception of journal boxes 12 and 13 of thev rollers 14 andwl which `are arrangsd parallel with' thev axes of the reducing ro ut are normally .in such osition as to be out of contact with an artic e passing through the 'grooves of the reducing rolls. traps 16 and 17 are mounted on the projecting journals of these rollers and are connected bv links 18 and 19 with the ends of levers 20 and 21 which are pivotally mounted upon the housing 1 as clearly shown in Figs. 3 and 4. The levers 20 are connected at points adjacent to their inner ends with the head 22 on Patented June s, 190e.

the stem 23 of a piston operating in the c vlinder 24, and the levers' 21 are similarly connected to a head 25 on the stern 26 of the pis- .ton in the cylinder 27, the cylinders 24 and 27 being arranged on the top of the housings.

In order to insure the equal and simultaneous movements of both pairs of levers, the inner ends of each pair are provided with interlocking teeth as shown in Figs. 3 and 4. A groove'd roller 28 has its 'ournal' boxes 29 movably mounted in the slot in which the roher 15 moves and these boxes 29 are connected bylinks 30 with the levers 21 at points inside of their pivotal support or .fulcrum. By reason of the manner of v'connecting the rollers 15 and 28 to the levers 21, said rollers can be caused to approach each other and grip the billet or ipe when the lower roller is raised and can lie moved away from ech other out `of the plane of movement of t Ae dro ped down below the lane oi movement of t ebilletpassingthroug the reducingrolls.

Simultaneous with the gripping ofthe billet or pipe the roller 14 on the feed side of the rolls is also raised so that when the billet or pipe returned to the feed side of the rolls, it will not come into, contact with either of the reducing rolls, the up er reducing roll havingbeen raised sufiicient y for the proper movement of the billet or ping rollers. 1,5 and 28 are positively driven y chains passing over sprockets 31 or their journals, as shown in Fig..3, said chains .belng driven from any suitablepart or parts of Pipa. The gripthe mill. As indicated at Fig. 4, the roller i' 14' l may alsov be driven. Thesel rollers are driven 1n a direction the reverse of the direction of rotation of the reducing rolls.

The plug or ball onto which the billet `is rolled by the reducing rolls is carried on a hollow mandrel 32, said mandrels being secured at their rear ends in blocks 33 carried by the 'cross headc 34. These blocks are de'tachablyl secured in position in any suitable manner preferably by means of a lug or projection 35 engaging'a recess in one of the walls of pockets or chambers formed in the Y escapes by a pipe 39. The cross head 34 is connected to the piston rod 4'joa fluid pressure cylinder 41 clearly shown in Figs. 1 and 2. e The mandrelsextend along grooves in a table or bed 42 whose inner walls are so shaped to form shoulders or projections 43 at intervals, thus reducing the area of contact between the wall of the grooves and the tube or billetunder reduction. The i'orwardends of the mandrels are supported byrollers47, projecting through slots in the bed 42 and mounted in one end of levers 48, the opposite ends of which are connected to weights 49. The upward movement of the rollers 47 and consequently of the mandrels carried thereby is limited by a' flattened portion el' the levers abutting against lthe underside of the table adjacent tothe slots through which the rollers project. These rollers will hold the mandrel in proper aline.- ment vertically with the grooves in the rolls,

.but will yield down and permit of the movement of the billet along the mandrels. In order toprevent an upward buckling or bending of the mandrel with the tubes, a series of dogs 5.0 are pivotally mounted on the upper edges of the ribs vbetween adjacent grooves in the table, as shown in Fig. 8. In order to lock these dogs in proper position a T-shaped bar 51 is mounted in a groove formed longitudinally of the ribs 52 and is provided at intervals with notches which when irl line with the dogs will permit the latter 'to swing upward. These rails or bars 51 are preferably held in position by means ofpins 53 secured in the bar transversely of the web and projecting into longitudinal grooves in the ribs 52, as shown in Fig. 7. The longitudinal movement oi .the bars or rails is effected by means of levers 54, connected to the -rear ends of the rails and pivotally mounted upon the bed.

planes tangential to adjacent portions of the arranged to shift said rollers toward each other to ositively grip and shift the article being ro led to a position between planes tangential to adjacent portions 'of the reduc 'ing rolls when separ'atejd or .in inoperative positions, and means for rotating said rollers reversely to the direction of rotation of the reducing rolls.

i l2. In a rolling mill, the combination of reducing rolls, means for moving one of said rolls toward and from the other roll, rollers arranged on'the delivery side of the rolls, means arranged to simultaneously shift said rollers toward each other to.`V rip and move the article being rolled out o f ,eontact with the rolls and to shift the rollers out of the path of movement of the article while being reduced, and means f or rotating said rollers reversely to the directiorn of rotation of the reducing rolls.

' 3. lIn a rolling mill, the combination of reducing rolls, means for moving the u er roll toward and from the lower roll, ro ers arranged on the feed and delivery sides of the rolls, means for shifting said rollers to positions above and below a plane tangential to that portion of the lower roll which defines the lower portion of the pass between the rolls and means forrotating one of said rollers reversely to the direction of rotation of the reducin rolls. f

4. In a ro ling mill, the combination of reducing rolls, means for moving one of said rolls toward and from the other roll, a pair of rollers, means for rotating said rollers, a pair of levers, connections from the rollers to the levers, the connections from the respective rollers being attached to the levers on opposite sides of the fulcrums of said levers.

5. In a `rolling mill, the combination of reducing rolls, a roller arranged on one side of the lower roll, means for changing the relative ositions of the roller and one ofthe rolls relative to the other roll whereby the article `rolls when operating oir the article, means the plugs or balls.

4,secured to said blocks and means for locking the blocks within the cross head.

combination of grooved rolls', a receiving Aall;r attached to the ribs and a lock for'holding the locking dogs in Y operative position with relation to the pipes Y tion ofthe tubes to be rolled, a series of loc mounted in said ribs provided with notches to permit of the assage of the ends of the locking dogs and)` means for shifting the T-shaped bars.

10. ing pipe the method herein described which consists in pas'sin the article through lbetween 'a pair of rol s, the article during 'such reduction being free from distorting'pressure voutside of the bite of said rolls,` moving one of s aid rolls from the other without reversing the direction of rotation, gripping the article between feed rollers arranged in operative relation to the'rolls, but rotating in reverse direction, and by the operation of said rollers passing the article back between the g selarate rolls and out of contact therewith.

the charging'side ofthe rolls to permit of the lremoval and replacement of ward ends on 7. In a mill for .rolling tubes, the combination 0f` a` movable cross-head provided with recesses or` chambers, blocks arranged in said chambers or recesses, mandrel bars 8. In a mill for'rolling tubes, etc., the

table having grooves therein in alinement with the grooves ofthe rolls, a series of locking dogs for each groove of the table. pivotbetween the grooves i or tubes being rolled. A

9. In a mill foirrolling tuble'ls, the combil nation of groove reducing ro s, a receiving s s table having grooves therein for the rece l MARSHALL l" C'APRQN ii- I Vv'itnesses:

EsTnLLn CULLIN,

J. L. BIRDsALL.

my hand.

ing dogs pivotallyl connected to the ribs between the grooves, a sliding T-shaped' bar i As animprovement in the art of rolln testimony whereof, have hereunto set 

